What is the difference between the left and right sides of complete turbulence region on the Moody chart?

Ans:

Left side of critical region:

- Flow is Laminar

- Friction factor depends only upon Reynolds number

Just to the right of critical region:

- It is called transition region

- f depends upon Reynolds number and e/D

Far right side of Moody chart:

- It is called 'fully rough zone' or 'fully turbulent zone'

- f depends upon e/D only (relative roughness)